,-----------------.                                                                                                                  
                                         |/usr/bin/sendmail|                                                                                                                  
                                         |-----------------|                                                                                                                  
                                         |Postfix - Modul  |                                                                                                                  
                                         |"postdrop"       |                                                                                                                  
                                         `-----------------'                                                                                                                  
                                                  |                                                                                                                           
                                                  |                                            ---------------------------------------                                        
                                                  |                                                                                      ,-----------------------------------.
                                                  |                                                                                      |Lookup Table access_client         |
                                          ,---------------.              ,--------.            ,-------------------------------------.   |-----------------------------------|
                                          |maildrop       |   ,------.   |Internet|   ,-----.  |Realtime Blockhole Lists             |   |Lookup Table access_recipient      |
                                          |---------------|   |pickup|   |--------|   |smtpd|  |-------------------------------------|   |Lookup Table access_recipient-rfc  |
                                          |Postfix - Queue|---|------|   |TCP/IP  |-- |-----|--|von einliefernden Hosts              |   |Lookup Table access_sender         |
                                          |"maildrop"     |   |Modul |   |Port 25 |   |Modul|  |reverse DNS-Abfrage z.B. bei SPAMHAUS|   |Tabellen zum Black- und Whitelisten|
                                          `---------------'   `------'   `--------'   `-----'  |                                     |   |an Hand der IP-Adrese, Hostname,   |
                                                                                               `-------------------------------------'   |Empfänger oder Sender              |
                                                                                                                                         |                                   |
                                                                                                                                         `-----------------------------------'
                                    ----------------------------------                                                                                                        
 ,------------------------------.   ,--------------------------------.                                                                                                        
 |Lookup Table canonical_maps   |   |Lookup Table virtual_maps       |   ,-------.   ,------.                                                                                 
 |------------------------------|   |--------------------------------|   |cleanup|   |bounce|                                                                                 
 |Umschreiben von nicht-lokalen |   |aller lokalen, virtuellen und   |   |-------|   |------|                                                                                 
 |Empfängeradressen             |   |entfernten eMialadressen        |---|Modul  |   |Modul |                                                                                 
 |                              |   |                                |   `-------'   `------'                                                                                 
 `------------------------------'   `--------------------------------'                                                                                                        
                                                                                                                                                                              
                                                                                                                                                                              
                            ,---------------.                            ,-------.                                                                                            
                            |incoming       |                            |rewrite|                                                                                            
                            |---------------|                            |-------|                                                                                            
                            |Postfix - Queue|                            |Modul  |                                                                                            
                            |"incoming"     |                            `-------'                                                                                            
                            `---------------'                                                                                                                                 
                                                                                                                                                                              
               ,---------------.   ,----------------------------.               ,---------------.                                                                             
               |active         |   |Lookup Table  transport_maps|   ,-------.   |deferred       |                                                                             
               |---------------|   |----------------------------|   |resolve|   |---------------|                                                                             
               |Postfix - Queue|   |Weiterleitung an einen      |---|-------|   |Postfix - Queue|                                                                             
               |"active"       |   |weiteren (finalen) MTA.     |   |Modul  |   |"deferred"     |                                                                             
               `---------------'   |                            |   `-------'   `---------------'                                                                             
                                   `----------------------------'        |                                                                                                    
                                                                         |                                                                                                    
,-----------------------------------.  ,-------------------------.       |                                                                                                    
|Lookup Table relocated_maps        |  |Lookup Table generic_maps|   ,-----.                                                                                                  
|-----------------------------------|  |-------------------------|   |qmgr |                                                                                                  
|mit Angabe der neuen eMailadresse  |  |von eMailadressen        |   |-----|                                                                                                  
|bei verzogenen Accounts.           |  |beim Versenden.          |---|Modul|                                                                                                  
|                                   |  |                         |   `-----'                                                                                                  
`-----------------------------------'  `-------------------------'                                                                                                            
                                                                                                                                                                              
                                                                          -----------------                                                                                   
             ,-------------------------------------.                                          ,------------------------------.                                                
             |Lookup Table .forward                |   ,-----.  ,-----.   ,-----.   ,-----.   |Lookup Table /etc/aliases     |                                                
             |-------------------------------------|   |smtp |  |local|   |pipe |   |lmtp |   |------------------------------|                                                
             |automatischen Anwesenheitsnachrichten|   |-----|  |-----|   |-----|   |-----|   |an lokale Empfänger zugewiesen|                                                
             |                                     |   |Modul|  |Modul|   |Modul|   |Modul|   |werden können.                |                                                
             `-------------------------------------'   `-----'  `-----'   `-----'   `-----'   |                              |                                                
                                                                                              `------------------------------'                                                
                                                                                                                                                                              
             ,-------------------------------.                                                                                                                                
             |MTA                            |   ,-----------------.   ,------------------------------.   ,---------------------.                                             
             |-------------------------------|   |mailbox          |   |Mailman                       |   |MDA                  |                                             
             |(Mail Transport Agent)         |   |-----------------|   |------------------------------|   |---------------------|                                             
             |andere SMTP-Server (Relayhosts)|   |Postfix - Queue  |   |Weitergabe der eMail          |   |(Mail Delivery Agent)|                                             
             |im Internet bzw. Intranet      |   |"mailbox"        |   |an Mailinglisten / wie Mailman|   |Dovecot IMAP-Server  |                                             
             |TCP/IP - Port 25               |   |lokale Zustellung|   |oder via UUCP ...             |   |TCP/IP - Port 24     |                                             
             `-------------------------------'   `-----------------'   `------------------------------'   `---------------------'